<template>
  <view>
    <my-search @click='gotoSearch'></my-search>
    
    <view class="scroll-view-container">
    <!-- 左侧 -->
      <scroll-view class="left-scroll-view" scroll-y='true' :style="{height: wh + 'px'}">
        <view :class="['left-scroll-item', i === active? 'active': '']" v-for="(item,i) in cateList" :key="i" @click="activeChanged(i)">{{item.cat_name}}</view>
      </scroll-view>
      <!-- 右侧 -->
      <scroll-view class="right-scroll-view" scroll-y='true' :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <!-- 右边图片与标题 -->
        <view v-for="(item2,i2) in cateLevel" :key="i2">
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3"  @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '../../mixnis/tabbar-badge.js'
  
  export default {
    mixins:[badgeMix],
    data() {
      return {
        wh: 0,
        active: 0,
        cateList:[],
        cateLevel:[],
        //  切换商品  重新回到顶部
        scrollTop:0
      };
    },
    onLoad(){
      // 程序一加载 获取页面可用高度
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const { data:res } =await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        
        this.cateList = res.message
        this.cateLevel = res.message[0].children
      },
      activeChanged(i){
        this.active = i
        // 点击后重新给右边赋值
        this.cateLevel = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1: 0
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid='+ item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    },
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  background-color: #FFFFFF;
}
.left-scroll-view{
  width: 120px;
}
.left-scroll-item{
  line-height: 60px;
  background-color: #f7f7f7;
  text-align: center;
  font-size: 12px;
}
.active{
  background-color: #FFFFFF;
  position: relative;
}
.active::before{
  content: ' ';
  width: 3px;
  height: 30px;
  background-color: #c00000;
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
}
.cate-lv3-item{
  width: 33%;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 10px;
}
.cate-lv3-item image{
  width: 60px;
  height: 60px;
}
.cate-lv3-item text{
  font-size: 12px;
}
</style>



